Risk analysis involves systematically collecting data and undertaking risk assessments of predefined hazards and vulnerabilities. Monitoring and warning involves a study of the factors that indicate a disaster is imminent, as well as the methods used to detect these factors. Dissemination and communication concerns communicating the risk information and warnings to reach those in danger in a way that is clear and understandable. Finally, an adequate response capability requires the building of national and community response plan, testing of the plan, and the promotion of readiness to ensure that people know how to respond to warnings. An early warning system is more than a
warning system, which is simply a means by which an alert can be disseminated to the public.
In defense Early-warning radars,
early warning satellites, and
Airborne early warning and control are systems used for detecting potential missile attacks. Throughout human history the warning systems that use such have malfunctioned several times, including some
nuclear-weapons-related false alarms. Due to the massive availability of information through (social) media, early-warning systems that use these vast amounts of information are also developed to potentially detect risks of terrorism and novel terror attacks. This builds on the assumption that aggregated news coverage functions as a
wisdom-of-the-crowd mechanism, where aggregated (and quantified) information can provide a reliable and cost-effective source of information for more accurate and precise predictions. The easiest or most likely artificial signals from Earth to be detectable
from around distant stars are brief pulses transmitted by such anti-ballistic missile (ABM) early-warning and space-surveillance radars during the Cold War and later astronomical and military radars.
For natural disasters Scientists are researching and developing systems to predict eruptions
of volcanoes,
earthquakes and other natural disasters.
Earthquakes For diseases Early warning systems could be developed and used to
prevent and mitigate pandemics, e.g. before they
spillover from other animals to humans, and disease outbreaks.
For climate adaptation Because of changes in
extreme weather and
sea level rise, due to climate change, the UN has recommended early warning systems as key elements of
climate change adaptation and
climate risk management. Flooding, cyclones and other rapidly changing weather events can make communities in coastal areas, along flood zones and reliant on agriculture very vulnerable to extreme events. Similarly the WHO recommends early warning systems to prevent increases in heatwave related morbidity and disease outbreaks.
Monitoring attempts at solar radiation modification U.S. government agencies are operating an airborne early warning system for detecting small concentrations of aerosols to detect where other countries might be carrying out
geoengineering attempts.
For chemical concerns A large number of
chemical substances (approximately 350,000) have been created and used without full understanding of the hazards and risks that they each pose. Chemicals have the potential to cause
environmental degradation and harm to human health. Chemical prioritisation and early warning systems are being created to help understand which chemicals should be focused upon for regulatory interventions. The
Environment Agency in England have set up a National scale Prioritisation and Early Warning System (PEWS) for
contaminants of emerging concern. ==History ==